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Commitments and Contingencies - Legal Proceedings (Detail) - Maximum $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Maurepas Project Dispute |
Loss Contingencies [Line Items] |
Reasonable possible loss | $ 22.0
Lorenzo Benton v Telecom Network Specialists Inc |
Loss Contingencies [Line Items] |
Reasonable possible loss | 11.1
Damages sought | $ 11.1

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